WO2016096462A1 - Spark plugs with central electrode - Google Patents
Spark plugs with central electrode Download PDFInfo
- Publication number
- WO2016096462A1 WO2016096462A1 PCT/EP2015/078538 EP2015078538W WO2016096462A1 WO 2016096462 A1 WO2016096462 A1 WO 2016096462A1 EP 2015078538 W EP2015078538 W EP 2015078538W WO 2016096462 A1 WO2016096462 A1 WO 2016096462A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- electrode
- core
- spark plug
- base body
- region
- Prior art date
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01T—SPARK GAPS; OVERVOLTAGE ARRESTERS USING SPARK GAPS; SPARKING PLUGS; CORONA DEVICES; GENERATING IONS TO BE INTRODUCED INTO NON-ENCLOSED GASES
- H01T13/00—Sparking plugs
- H01T13/20—Sparking plugs characterised by features of the electrodes or insulation
- H01T13/39—Selection of materials for electrodes
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01T—SPARK GAPS; OVERVOLTAGE ARRESTERS USING SPARK GAPS; SPARKING PLUGS; CORONA DEVICES; GENERATING IONS TO BE INTRODUCED INTO NON-ENCLOSED GASES
- H01T13/00—Sparking plugs
- H01T13/02—Details
- H01T13/16—Means for dissipating heat
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01T—SPARK GAPS; OVERVOLTAGE ARRESTERS USING SPARK GAPS; SPARKING PLUGS; CORONA DEVICES; GENERATING IONS TO BE INTRODUCED INTO NON-ENCLOSED GASES
- H01T13/00—Sparking plugs
- H01T13/20—Sparking plugs characterised by features of the electrodes or insulation
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01T—SPARK GAPS; OVERVOLTAGE ARRESTERS USING SPARK GAPS; SPARKING PLUGS; CORONA DEVICES; GENERATING IONS TO BE INTRODUCED INTO NON-ENCLOSED GASES
- H01T13/00—Sparking plugs
- H01T13/20—Sparking plugs characterised by features of the electrodes or insulation
- H01T13/32—Sparking plugs characterised by features of the electrodes or insulation characterised by features of the earthed electrode
Definitions
- the invention is based on a spark plug according to the preamble of the independent claim.
- the spark plug should have the same good ignition reliability and the same long life as previous spark plugs not subject to downsizing.
- the insulator is the more sensitive component in the spark plug due to its ceramic nature compared to the metallic components in terms of mechanical and electrical loads.
- spark plugs having a housing, an insulator disposed in the housing, a center electrode arranged in the insulator and a ground electrode arranged on the housing, the ground electrode and the center electrode being arranged relative to one another such that the ground electrode and the center electrode form a spark gap form, and wherein the center electrode with a Cartridge head rests on a formed on an inner side of the insulator seat, and wherein the center electrode has an electrode base body and a in the
- Electrode body arranged core wherein the core consists of a material having a higher thermal conductivity than the material of the electrode body, to ensure the mechanical and electrical stability of the insulator should not be less than a minimum wall thickness. It is important to achieve an optimum between the stability and heat dissipation of the insulator on the one hand and the heat dissipation of the spark plug overall and the life of the spark plug on the other.
- the object of the present invention is to provide a spark plug that can meet the requirements mentioned above.
- Electrode body is formed and the electrode body a
- Diameter of not greater than 1.7 mm is achieved according to the invention that a spark plug with this center electrode meets the above requirements.
- the insulator can be formed with a sufficient wall thickness, whereby the
- Spark plug can withstand the thermal, mechanical and electrical loads during operation.
- the center electrode or the electrode main body can have regions of different diameters. The mentioned limits for the diameter of the
- Electrode basic body refer in each case to the largest diameter of the
- Electrode base body neglecting the electrode head.
- Electrode head is formed at the combustion chamber-remote end of the center electrode.
- the electrode head rests on a seat formed on the inside of the insulator.
- the electrode head extends from the seat formed on the inside of the insulator to the end of the center electrode facing away from the combustion chamber. If the geometry of the cross section of the electrode main body deviates from the round shape, then the diameter refers to the circumference of the non-circular
- the diameter of the electrode main body is not greater than 1.5 mm.
- Electrode body is not less than 1 mm, so that the stability of the center electrode itself is not compromised.
- the electrode main body should have this minimum diameter, so that the cross section of the electrode body is large enough for sufficient heat dissipation along the center electrode, so that the insulator at its combustion chamber end next to that from the combustion chamber
- the housing and the center electrode are at different electrical
- the center electrode and the housing have, by design, their smallest distance from each other. As a result, this area of the insulator is very susceptible to electrical breakdown. To prevent these electrical breakdowns on the insulator, it has been found to be advantageous that the insulator in the region of the seat formed on its inside a
- the core of the electrode base body consists of a material which has a higher thermal conductivity than the material of the electrode base body. As a result, the heat conduction within the electrode body is favored.
- the material of the core preferably has a thermal conductivity of at least 350 W / m K at room temperature.
- the thermal conductivity of the material of the core is at least 300 W / mK greater than the thermal conductivity of the material of the electrode body.
- the electrode base body has, for example, a nickel-containing alloy.
- the alloy preferably contains at least 20% by weight of chromium, in particular at least 25% by weight of chromium. In an alternative nickel alloy, this contains alternatively or additionally yttrium.
- the core consists for example of copper or silver or an alloy with copper and / or silver. Investigations by the Applicant have shown that, for example, a copper-containing core in the electrode base body reduces the temperature at the end of the electrode main body facing the combustion chamber by 50-80K.
- Cross sectional area of the core not less than 20% of the cross sectional area of the
- Electrode body or the center electrode is in at least a first region, wherein in the at least one first region of the electrode base body and the core each have a constant diameter.
- the cross-sectional area of the electrode main body is composed of the cross-sectional area of the core and the cross-sectional area of the shell.
- the at least one first region is cylindrical.
- the at least one first region preferably has a length along the longitudinal axis of the center electrode which is equal to or longer than the diameter of the electrode main body in this first region, in particular the length of the at least one first region is at least 1.5 times as long as the first electrode Diameter of the electrode body.
- the cross-sectional area of the core corresponds to a maximum of 65% of the total cross-sectional area of the electrode main body or of the center electrode. This ensures that the center electrode has a sufficiently large shell thickness.
- the electrode base body consists of a more wear-resistant material than the core, so that preferably the electrode base body must have a minimum cladding thickness so that the center electrode has a sufficiently long life, for example at least 50,000 km. It has proved to be advantageous if the electrode main body has a minimum cladding thickness of not less than 0.15 mm, in particular not less than 0.25 mm. Additionally or alternatively, it can be provided that the jacket thickness in the at least one first region with constant diameters of the core and the electrode main body is not greater than 0.35 mm.
- the center electrode on its combustion chamber-side end face on a precious metal-containing ignition surface, which has a higher wear resistance than the electrode body material.
- the distance b from the firing surface to the core has a value in the range of 0.2 mm to 2 mm.
- the center electrode has no
- the distance b from the combustion-chamber-side end face of the electrode main body to the combustion-chamber-side end of the core is at least 0.6 mm long in order to ensure a sufficiently long service life of the center electrode.
- the distance b preferably has a value not smaller than 1 mm, and especially not larger than 3.5 mm.
- Cross-sectional area of the electrode main body have the same geometric shape, in particular the core within a cross-sectional plane in the middle in
- Electrode body is arranged. This ensures that the
- Electrode body has a uniform shell thickness within the cross-sectional plane.
- Spark plug with a reduced outer diameter of the housing are within the meaning of this application spark plugs whose threads have a smaller outer diameter than 14 mm, for example, so-called M12 or MIO spark plugs.
- FIG. 1 shows two examples of central electrodes
- FIG. 3 shows a spark plug according to the invention with a center electrode
- FIG. 1 shows schematic representations for two exemplary embodiments of the center electrode 10.
- the center electrode 10 has an electrode base body 11 and a core 12 which is arranged inside the electrode base body 12.
- the core 11 is made of a material having a higher thermal conductivity than the material of the electrode base body 11.
- the material of the electrode base body 11 has a higher wear resistance than the material of the core 12.
- the core 12 is made of copper, silver or an alloy with copper and / or silver.
- a Ni alloy is preferably used, while chromium and / or yttrium may be contained in the alloy.
- the core of the center electrode 10 shown here in section has at least a first portion 15a, in which the core 12 has a relatively constant diameter d K.
- the term "relatively constant" means that the diameter d K in the section changes its value by a maximum of 5%.
- the diameter d K of the core 12 is reduced within a second section 14a.
- the at least one first section 15a is arranged on a side of the center electrode 10 facing away from the combustion chamber, wherein an electrode head 4 (not shown) adjoins the end of the first section facing away from the combustion chamber 15 is formed.
- the second section 14a adjoins the at least one first section 15a.
- the core 12 it is conceivable for the core 12 to have a plurality of first sections 15a with constant diameters d K , the diameters d K of the individual first sections 15a being different. This is the case in particular when the center electrode 10 or the electrode main body 11 itself has several
- the center electrode 10 shown in FIG. 1 is constructed from an electrode main body 11 which has a constant diameter d E along its length and thus also the center electrode 10 has a constant diameter d E.
- the electrode main body 11 In the electrode main body 11, at least three regions 13, 14, 15 can be distinguished.
- the electrode main body 11 In a first region 15, the electrode main body 11 has a core 12 with a constant diameter d K.
- the second region 14a In a second region 14a, the
- Electrode base body 11 a core 12 with a continuously reducing diameter d K on. In a third region 13, the electrode main body 11 has no core.
- the thickness c of the jacket of the electrode base body 11 results from half the difference of the electrode body diameter d E to the core diameter d K.
- the shell thickness c in this first region 15 is constant. It is advantageously provided that in this first region 15, the jacket thickness c of the electrode base body 11 is not less than 0.15 mm and not greater than 0.35 mm, for example, the jacket thickness c is equal to 0.25 mm or smaller.
- the jacket thickness c is at least 0.15 mm thick in the region 14.
- the diameter d E2 of the electrode base body 11 in the second region 14 can likewise be reduced.
- the jacket thickness c is preferably 0.15 mm to 0.35 mm. It can be provided that the diameter d E2 of
- Electrode body 11 changes at the same rate as the diameter d K of the core 12. This has the advantage that the jacket thickness c remains constant in the second region 14.
- the third region 13 of the electrode main body 11 There is no core in the third region 13 of the electrode main body 11, and thus the jacket thickness c corresponds to half the diameter d E3 of the electrode base body 11.
- the third region 13 preferably has a constant diameter d E3 which corresponds to the diameter d E2 of the second region 14 during the transition to the third area 13 corresponds.
- the third region 13 of the electrode main body 11 has a length b, which extends from a combustion-chamber-side end 17 of the core 12 to a combustion-chamber-side end
- the length b is not greater than 3.5 mm. If the center electrode 10 is formed with a noble metal-containing ignition surface 19, the length b may be formed shorter than without igniter surface 19 containing noble metal, as shown in Figure lb. If a noble metal-containing ignition surface 19 is dispensed with, as shown in FIG. 1 a, the length b should have a minimum length of 0.6 mm, so that the noble metal base body 12 has enough material for a sufficiently long service life of the center electrode 10. When using a noble metal-containing ignition surface 19 extends a length b of at least 0.2 mm for a sufficiently long life of the center electrode 10th
- Figure 2 shows an example of a cross section of the center electrode 10.
- the diameter d E of the center electrode 10 and the electrode base body 11 is smaller than 1.7 mm.
- the cross section of the core 12 is arranged centrally in the cross section of the central electrode 10 or of the electrode main body 11.
- Electrode base body 11 results from half the difference of
- Electrode body diameter d E to the core diameter d K.
- the cross sections of the electrode main body 11 and the core 12 have the same geometric shape.
- Figure 3 shows a schematic representation of a spark plug 1 with a
- the spark plug 1 has a metallic housing 2 with a thread for mounting the spark plug 1 in a cylinder head. Furthermore, the housing has a hexagonal section 9, on which a tool for the assembly of the spark plug 1 is set in the cylinder head.
- Housing 2 an insulator 3 is arranged.
- Connection bolts 7 are arranged inside the insulator 3 and via a
- a seat (3a) is formed, on which the center electrode (10) rests with its center electrode head (4).
- the insulator (3) has a wall thickness of not less than 2 mm in the region of the seat (3a).
- the center electrode 10 typically protrudes from the insulator 3 at the combustion chamber end of the spark plug 1.
- the center electrode has a main body 10 and an ignition surface 19 arranged at the combustion chamber end of the main body.
- the main body 10 has a core 12 which is surrounded by a jacket 11.
- a ground electrode 5 is arranged. Which forms a spark gap together with the center electrode 10.
- the ground electrode 5 may be formed as a roof electrode, side electrode or ironing electrode.
Landscapes
- Spark Plugs (AREA)
- Ignition Installations For Internal Combustion Engines (AREA)
Abstract
Description
Claims
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US15/536,000 US10250015B2 (en) | 2014-12-16 | 2015-12-03 | Spark plugs having a center electrode |
JP2017530156A JP6753852B2 (en) | 2014-12-16 | 2015-12-03 | Spark plug with center electrode |
KR1020177016467A KR20170094230A (en) | 2014-12-16 | 2015-12-03 | Spark plugs with central electrode |
ES15804147T ES2865177T3 (en) | 2014-12-16 | 2015-12-03 | Spark plugs with center electrode |
EP15804147.5A EP3235079B1 (en) | 2014-12-16 | 2015-12-03 | Spark plugs with central electrode |
CN201580068464.9A CN107005029A (en) | 2014-12-16 | 2015-12-03 | Spark plug with central electrode |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102014226107.4 | 2014-12-16 | ||
DE102014226107.4A DE102014226107A1 (en) | 2014-12-16 | 2014-12-16 | Spark plugs with center electrode |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2016096462A1 true WO2016096462A1 (en) | 2016-06-23 |
Family
ID=54771131
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2015/078538 WO2016096462A1 (en) | 2014-12-16 | 2015-12-03 | Spark plugs with central electrode |
Country Status (8)
Country | Link |
---|---|
US (1) | US10250015B2 (en) |
EP (1) | EP3235079B1 (en) |
JP (1) | JP6753852B2 (en) |
KR (1) | KR20170094230A (en) |
CN (1) | CN107005029A (en) |
DE (1) | DE102014226107A1 (en) |
ES (1) | ES2865177T3 (en) |
WO (1) | WO2016096462A1 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102014226107A1 (en) | 2014-12-16 | 2016-06-16 | Robert Bosch Gmbh | Spark plugs with center electrode |
Citations (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0737672A (en) | 1993-07-22 | 1995-02-07 | Ngk Spark Plug Co Ltd | Spark plug for internal combustion engine |
DE19854861A1 (en) * | 1998-11-27 | 2000-05-31 | Beru Ag | spark plug |
US6528929B1 (en) | 1998-11-11 | 2003-03-04 | Ngk Spark Plug Co., Ltd. | Spark plug with iridium-based alloy chip |
DE102004044152A1 (en) | 2003-09-11 | 2005-04-07 | NGK Spark Plug Co., Ltd., Nagoya | spark plug |
JP2005108821A (en) | 2003-09-11 | 2005-04-21 | Ngk Spark Plug Co Ltd | Spark plug |
JP2005327743A (en) | 1997-04-23 | 2005-11-24 | Ngk Spark Plug Co Ltd | Spark plug with resistor, resistor composition for spark plug, and manufacturing method of spark plug with resistor |
US20090127998A1 (en) | 2007-11-21 | 2009-05-21 | Ngk Spark Plug Co., Ltd. | Spark plug |
DE102013207714A1 (en) * | 2012-04-27 | 2013-10-31 | Ngk Spark Plug Co., Ltd. | Spark plug and method of making spark plug |
US20140111079A1 (en) * | 2011-06-17 | 2014-04-24 | Ngk Spark Plug Co., Ltd | Spark plug |
DE102014101607A1 (en) * | 2013-02-15 | 2014-08-21 | Federal-Mogul Ignition Company | Electrode core material for spark plugs |
DE102014226107A1 (en) | 2014-12-16 | 2016-06-16 | Robert Bosch Gmbh | Spark plugs with center electrode |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
BE788263A (en) * | 1971-08-02 | 1973-02-28 | Int Nickel Ltd | DISPERSION REINFORCED NICKEL-BASED ALLOYS, THEIR PREPARATION AND THEIR USE |
JPH0343982A (en) | 1989-07-07 | 1991-02-25 | Nippondenso Co Ltd | Manufacture of central electrode of ignition plug |
JP2006269441A (en) * | 1998-11-11 | 2006-10-05 | Ngk Spark Plug Co Ltd | Spark plug |
JP4159211B2 (en) | 1998-11-11 | 2008-10-01 | 日本特殊陶業株式会社 | Spark plug |
JP3795374B2 (en) * | 2001-10-31 | 2006-07-12 | 日本特殊陶業株式会社 | Spark plug |
US7599002B2 (en) | 2003-12-02 | 2009-10-06 | Logitech Europe S.A. | Network camera mounting system |
JP2005203119A (en) * | 2004-01-13 | 2005-07-28 | Ngk Spark Plug Co Ltd | Spark plug |
CN101346859B (en) * | 2006-03-14 | 2012-06-27 | 日本特殊陶业株式会社 | Method for manufacturing spark plug and spark plug |
JP2010165698A (en) | 2010-05-07 | 2010-07-29 | Ngk Spark Plug Co Ltd | Spark plug |
JP2014038773A (en) * | 2012-08-17 | 2014-02-27 | Ngk Spark Plug Co Ltd | Spark plug |
-
2014
- 2014-12-16 DE DE102014226107.4A patent/DE102014226107A1/en not_active Withdrawn
-
2015
- 2015-12-03 WO PCT/EP2015/078538 patent/WO2016096462A1/en active Application Filing
- 2015-12-03 JP JP2017530156A patent/JP6753852B2/en active Active
- 2015-12-03 EP EP15804147.5A patent/EP3235079B1/en active Active
- 2015-12-03 CN CN201580068464.9A patent/CN107005029A/en active Pending
- 2015-12-03 US US15/536,000 patent/US10250015B2/en active Active
- 2015-12-03 ES ES15804147T patent/ES2865177T3/en active Active
- 2015-12-03 KR KR1020177016467A patent/KR20170094230A/en unknown
Patent Citations (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0737672A (en) | 1993-07-22 | 1995-02-07 | Ngk Spark Plug Co Ltd | Spark plug for internal combustion engine |
JP2005327743A (en) | 1997-04-23 | 2005-11-24 | Ngk Spark Plug Co Ltd | Spark plug with resistor, resistor composition for spark plug, and manufacturing method of spark plug with resistor |
US6528929B1 (en) | 1998-11-11 | 2003-03-04 | Ngk Spark Plug Co., Ltd. | Spark plug with iridium-based alloy chip |
DE19854861A1 (en) * | 1998-11-27 | 2000-05-31 | Beru Ag | spark plug |
DE102004044152A1 (en) | 2003-09-11 | 2005-04-07 | NGK Spark Plug Co., Ltd., Nagoya | spark plug |
JP2005108821A (en) | 2003-09-11 | 2005-04-21 | Ngk Spark Plug Co Ltd | Spark plug |
US20090127998A1 (en) | 2007-11-21 | 2009-05-21 | Ngk Spark Plug Co., Ltd. | Spark plug |
US20140111079A1 (en) * | 2011-06-17 | 2014-04-24 | Ngk Spark Plug Co., Ltd | Spark plug |
DE102013207714A1 (en) * | 2012-04-27 | 2013-10-31 | Ngk Spark Plug Co., Ltd. | Spark plug and method of making spark plug |
DE102014101607A1 (en) * | 2013-02-15 | 2014-08-21 | Federal-Mogul Ignition Company | Electrode core material for spark plugs |
DE102014226107A1 (en) | 2014-12-16 | 2016-06-16 | Robert Bosch Gmbh | Spark plugs with center electrode |
Also Published As
Publication number | Publication date |
---|---|
US10250015B2 (en) | 2019-04-02 |
CN107005029A (en) | 2017-08-01 |
EP3235079B1 (en) | 2021-02-17 |
ES2865177T3 (en) | 2021-10-15 |
DE102014226107A1 (en) | 2016-06-16 |
JP2017538270A (en) | 2017-12-21 |
JP6753852B2 (en) | 2020-09-09 |
US20170346260A1 (en) | 2017-11-30 |
KR20170094230A (en) | 2017-08-17 |
EP3235079A1 (en) | 2017-10-25 |
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